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Date: Tue, 25 Mar 2008 09:26:37 +0800
From: Li Zefan <lizf@...fujitsu.com>
To: Balbir Singh <balbir@...ux.vnet.ibm.com>
CC: linux-mm@...ck.org, Hugh Dickins <hugh@...itas.com>,
Sudhir Kumar <skumar@...ux.vnet.ibm.com>,
YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
Paul Menage <menage@...gle.com>, linux-kernel@...r.kernel.org,
taka@...inux.co.jp, David Rientjes <rientjes@...gle.com>,
Pavel Emelianov <xemul@...nvz.org>,
Andrew Morton <akpm@...ux-foundation.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [RFC][-mm] Memory controller add mm->owner
Balbir Singh wrote:
> This patch removes the mem_cgroup member from mm_struct and instead adds
> an owner. This approach was suggested by Paul Menage. The advantage of
> this approach is that, once the mm->owner is known, using the subsystem
> id, the cgroup can be determined. It also allows several control groups
> that are virtually grouped by mm_struct, to exist independent of the memory
> controller i.e., without adding mem_cgroup's for each controller,
> to mm_struct.
>
> The code initially assigns mm->owner to the task and then after the
> thread group leader is identified. The mm->owner is changed to the thread
> group leader of the task later at the end of copy_process.
>
> Signed-off-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
> ---
>
> include/linux/memcontrol.h | 14 +++++++++++++-
> include/linux/mm_types.h | 5 ++++-
> kernel/fork.c | 4 ++++
> mm/memcontrol.c | 42 ++++++++++++++++++++++++++++++++++--------
> 4 files changed, 55 insertions(+), 10 deletions(-)
>
> diff -puN include/linux/mm_types.h~memory-controller-add-mm-owner include/linux/mm_types.h
> --- linux-2.6.25-rc5/include/linux/mm_types.h~memory-controller-add-mm-owner 2008-03-20 13:35:09.000000000 +0530
> +++ linux-2.6.25-rc5-balbir/include/linux/mm_types.h 2008-03-20 15:11:05.000000000 +0530
> @@ -228,7 +228,10 @@ struct mm_struct {
> rwlock_t ioctx_list_lock;
> struct kioctx *ioctx_list;
> #ifdef CONFIG_CGROUP_MEM_RES_CTLR
> - struct mem_cgroup *mem_cgroup;
> + struct task_struct *owner; /* The thread group leader that */
> + /* owns the mm_struct. This */
> + /* might be useful even outside */
> + /* of the config option */
> #endif
>
> #ifdef CONFIG_PROC_FS
> diff -puN kernel/fork.c~memory-controller-add-mm-owner kernel/fork.c
> --- linux-2.6.25-rc5/kernel/fork.c~memory-controller-add-mm-owner 2008-03-20 13:35:09.000000000 +0530
> +++ linux-2.6.25-rc5-balbir/kernel/fork.c 2008-03-24 18:49:29.000000000 +0530
> @@ -1357,6 +1357,10 @@ static struct task_struct *copy_process(
> write_unlock_irq(&tasklist_lock);
> proc_fork_connector(p);
> cgroup_post_fork(p);
> +
> + if (!(clone_flags & CLONE_VM))
> + mem_cgroup_fork_init(p);
> +
> return p;
>
> bad_fork_free_pid:
> diff -puN include/linux/memcontrol.h~memory-controller-add-mm-owner include/linux/memcontrol.h
> --- linux-2.6.25-rc5/include/linux/memcontrol.h~memory-controller-add-mm-owner 2008-03-20 13:35:09.000000000 +0530
> +++ linux-2.6.25-rc5-balbir/include/linux/memcontrol.h 2008-03-24 18:49:52.000000000 +0530
> @@ -29,6 +29,7 @@ struct mm_struct;
>
> extern void mm_init_cgroup(struct mm_struct *mm, struct task_struct *p);
> extern void mm_free_cgroup(struct mm_struct *mm);
> +extern void mem_cgroup_fork_init(struct task_struct *p);
>
> #define page_reset_bad_cgroup(page) ((page)->page_cgroup = 0)
>
> @@ -49,7 +50,7 @@ extern void mem_cgroup_out_of_memory(str
> int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
>
> #define mm_match_cgroup(mm, cgroup) \
> - ((cgroup) == rcu_dereference((mm)->mem_cgroup))
> + ((cgroup) == mem_cgroup_from_task((mm)->owner))
>
> extern int mem_cgroup_prepare_migration(struct page *page);
> extern void mem_cgroup_end_migration(struct page *page);
> @@ -72,6 +73,8 @@ extern long mem_cgroup_calc_reclaim_acti
> extern long mem_cgroup_calc_reclaim_inactive(struct mem_cgroup *mem,
> struct zone *zone, int priority);
>
> +extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
> +
> #else /* CONFIG_CGROUP_MEM_RES_CTLR */
> static inline void mm_init_cgroup(struct mm_struct *mm,
> struct task_struct *p)
> @@ -82,6 +85,10 @@ static inline void mm_free_cgroup(struct
> {
> }
>
> +static inline void mem_cgroup_fork_init(struct task_struct *p)
> +{
> +}
> +
> static inline void page_reset_bad_cgroup(struct page *page)
> {
> }
> @@ -172,6 +179,11 @@ static inline long mem_cgroup_calc_recla
> {
> return 0;
> }
> +
> +static void mm_free_fork_cgroup(struct task_struct *p)
> +{
> +}
> +
Where is this function used? I don't see the corresponding one
with CONFIG_CGROUP_MEM_RES_CTLR enabled?
> #endif /* CONFIG_CGROUP_MEM_CONT */
>
> #endif /* _LINUX_MEMCONTROL_H */
> diff -puN mm/memcontrol.c~memory-controller-add-mm-owner mm/memcontrol.c
> --- linux-2.6.25-rc5/mm/memcontrol.c~memory-controller-add-mm-owner 2008-03-20 13:35:09.000000000 +0530
> +++ linux-2.6.25-rc5-balbir/mm/memcontrol.c 2008-03-24 19:04:32.000000000 +0530
> @@ -236,7 +236,7 @@ static struct mem_cgroup *mem_cgroup_fro
> css);
> }
>
> -static struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
> +struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
> {
> return container_of(task_subsys_state(p, mem_cgroup_subsys_id),
> struct mem_cgroup, css);
> @@ -248,12 +248,40 @@ void mm_init_cgroup(struct mm_struct *mm
>
> mem = mem_cgroup_from_task(p);
> css_get(&mem->css);
> - mm->mem_cgroup = mem;
> + mm->owner = p;
> +}
> +
> +void mem_cgroup_fork_init(struct task_struct *p)
> +{
> + struct mm_struct *mm = get_task_mm(p);
> + struct mem_cgroup *mem, *oldmem;
Leave an empty line here.
> + if (!mm)
> + return;
> +
> + /*
> + * Initial owner at mm_init_cgroup() time is the task itself.
> + * The thread group leader had not been setup then
> + */
> + oldmem = mem_cgroup_from_task(mm->owner);
> + /*
> + * Override the mm->owner after we know the thread group later
> + */
> + mm->owner = p->group_leader;
> + mem = mem_cgroup_from_task(mm->owner);
> + css_get(&mem->css);
> + css_put(&oldmem->css);
> + mmput(mm);
> }
>
> void mm_free_cgroup(struct mm_struct *mm)
> {
> - css_put(&mm->mem_cgroup->css);
> + struct mem_cgroup *mem;
> +
> + /*
> + * TODO: Should we assign mm->owner to NULL here?
> + */
> + mem = mem_cgroup_from_task(mm->owner);
> + css_put(&mem->css);
> }
>
> static inline int page_cgroup_locked(struct page *page)
> @@ -476,6 +504,7 @@ unsigned long mem_cgroup_isolate_pages(u
> int zid = zone_idx(z);
> struct mem_cgroup_per_zone *mz;
>
> + BUG_ON(!mem_cont);
> mz = mem_cgroup_zoneinfo(mem_cont, nid, zid);
> if (active)
> src = &mz->active_list;
> @@ -573,13 +602,11 @@ retry:
> if (!mm)
> mm = &init_mm;
>
> - rcu_read_lock();
> - mem = rcu_dereference(mm->mem_cgroup);
> + mem = mem_cgroup_from_task(mm->owner);
> /*
> * For every charge from the cgroup, increment reference count
> */
> css_get(&mem->css);
> - rcu_read_unlock();
>
> while (res_counter_charge(&mem->res, PAGE_SIZE)) {
> if (!(gfp_mask & __GFP_WAIT))
> @@ -988,7 +1015,7 @@ mem_cgroup_create(struct cgroup_subsys *
>
> if (unlikely((cont->parent) == NULL)) {
> mem = &init_mem_cgroup;
> - init_mm.mem_cgroup = mem;
> + init_mm.owner = &init_task;
> } else
> mem = kzalloc(sizeof(struct mem_cgroup), GFP_KERNEL);
>
> @@ -1069,7 +1096,6 @@ static void mem_cgroup_move_task(struct
> goto out;
>
> css_get(&mem->css);
> - rcu_assign_pointer(mm->mem_cgroup, mem);
> css_put(&old_mem->css);
>
> out:
> _
>
--
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